Shellfish gauge



FIG. 1 is a front elevation view of the shellfish gauge; the rear elevation view is a mirror image of the front, and therefore is not shown.

FIG. 2 is a right elevational view of the shellfish gauge; the left elevation view is a mirror image of the right, and therefore is not shown.

FIG. 3 is a top view of the shellfish gauge; and,

FIG. 4 is a bottom view of the shellfish gauge. 

The ornamental design for a shellfish gauge, as shown. 